Address:
10 "Tsarevo"
4000 Plovdiv, Bulgaria
Tel./Fax: (+359 32) 622 146
E-mail: ring@engineer.com, office@ring-bg.com
Web: www.ring-bg.com
Contact persons: Rumen Dimov
Foreign agency:
ABR-Lab - Battery Research Laboratory GmbH
Austria, Vienna
+43 650 3053505
